SEARCH FOR g - MODE FREQUENCIES IN THE GOLF OSCILLATIONS

The GOLF instrument, as its name implies, was designed to optimise the possibility of measuring low frequency oscillations, in the range of the g-modes and the lower p-modes. The high stability of the instrument , combined with a continuity of data close to 100 % has contributed to providing a velocity time series in which the instrumental noise is indeed extremely low. However, in the region of the expected g-modes, global oscillations compete with a quite signiicant solar velocity background, due to the non-global convective movements in the photo-sphere. With now 2 years of high-quality data, the GOLF team is employing several diierent techniques to search for these modes. An identiication of g-mode frequencies would yield a highly sensitive probe for the properties of the core, in contrast to the p-modes for which extremely precise frequencies are required for the inversion. We present here the current status of the g-mode search programme.